Obsidian Brown

Obsidian

Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, giving them a high viscosity. The high viscosity inhibits the diffusion of atoms through the lava, which inhibits the first step (nucleation) in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava.

Brown

Brown is a color. It can be thought as a darker, typically desaturated shade of orange, and can often be produced by combining red and yellow with another color, namely blue.

obsidian

Noun

1. A type of naturally occurring black glass produced by volcanoes.
2. A slightly bluish black, the color of obsidian glass.

Adjective

1. Black.

brown

Noun

1. A colour like that of chocolate or coffee.
2. One of the colour balls used in snooker, with a value of 4 points.

Adjective

1. Having a brown color/colour.
2. Gloomy.